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Atmospheric Chemistry and Physics An interactive open-access journal of the European Geosciences Union
doi:10.5194/acp-2017-73
© Author(s) 2017. This work is distributed
under the Creative Commons Attribution 3.0 License.
Research article
09 Mar 2017
Review status
This discussion paper is under review for the journal Atmospheric Chemistry and Physics (ACP).
Multifractal evaluation of simulated precipitation intensities from the COSMO NWP model
Daniel Wolfensberger1, Auguste Gires2, Ioulia Tchiguirinskaia2, Daniel Schertzer2, and Alexis Berne1 1LTE, Ecole polytechnique fédérale de Lausanne (EPFL), Lausanne, Switzerland
2HMCO, Ecole des Ponts, UPE, Champs-sur-Marne, France
Abstract. The framework of universal multifractals allows to characterize the spatio-temporal variability of fields over a wide range of scales with only a limited number of scale-invariant parameters. In this work, we perform a multifractal analysis of simulated fields of water contents in liquid, solid and gas phase from the COSMO numerical weather prediction model during three different events (one cold front associated with heavy snowfall, one stationary front with stratiform rain and one summer convection event) over Switzerland. The multifractal parameters of precipitation intensities at the ground are also compared with those obtained from the Swiss radar composite. The results of the analysis show that the COSMO simulations exhibit spatial scaling breaks that are not present in the radar data, indicating that the model is not able to simulate the observed variability at all scales. The impact of the topography on these conclusions was assessed by comparing a very steep area to a mostly flat area. It was observed that the topography does not seem to play a dominant role in the multifractal characterization of the COSMO water contents. Additionally, a spatio-temporal multifractal analysis of the COSMO simulations and the radar composite was performed and compared with a simplified scaling model of space-time variability.

Citation: Wolfensberger, D., Gires, A., Tchiguirinskaia, I., Schertzer, D., and Berne, A.: Multifractal evaluation of simulated precipitation intensities from the COSMO NWP model, Atmos. Chem. Phys. Discuss., doi:10.5194/acp-2017-73, in review, 2017.
Daniel Wolfensberger et al.
Daniel Wolfensberger et al.
Daniel Wolfensberger et al.

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Short summary
In this work, in order to analyse products from the COSMO weather prediction model and compare them with observations, we used the so-called universal multifractal framework which allows to characterize the variability of complex fields over a wide range of scales. Our results highlight the influence of the sub-grid parameterizations of COSMO by a break in the scaling properties which is not visible on the observations.
In this work, in order to analyse products from the COSMO weather prediction model and compare...
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